Amateur-Radio-Defense-1941-02.pdf

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AMATEUR
IZIEFEWSE
rRADIO17
PUBLICATION OFFI
Monadnock Building
San Francisco - California
FEBRUARY
1941
25
CENTS
Yearly Subscription $2.50
MALLORY
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Precision Products
FOR COMMUNICATION SERVICE
CONDENSERS
IR ANSMITTING
ETCHED
PLATE
What
OLUME CONTROLS
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Means 1111111111111031ECE011111
PUSH
BUTTON
Approved means that Mallory
products have been tested and ar-
cepted as standard by leading lab-
oratories, government services,
radio manufacturers and communi-
cation companies.
Like "Sterling" on silver, the trade-
mark "Mallory" is synonymous
with highest quality. Yet Mallory
products cost no more.
T& L
PADS
HARDWARE
Every radio operator and engineer
should have acopy of the Mallory
General Parts Catalog, Form
M-770. Send your request on your
company stationery, or if you are
an amateur, mail your QSL card.
RESISTOR S
DIAL LIGHTS
VIBRAPACKS
VIBRATORS
Cable Addre,— PELMAl 0
P. R. MALLORY & CO., Inc., INDIANAPOLIS, INDIANA
MALLORY
R R. MALLORY & CO..
Inc.
Use
APPROVED
PRECISION PRODUCTS
'b.
How would you like to go behind
the scenes on a personally escorted
Motion Picture Tour to see how
amateur communications equipment
is made?
Here is your opportunity to see each
step in precision production, from the
raw material to the finished receiver
with each step photographed from
actual work in the factory of the
"World's Largest Builders of Amateur
Communications Equipment."
At your next "Ham-Fest", show this
interesting 1000 foot Motion Picture
—know how communications equip-
ment is built. There is no charge. Here
is all you do: secure a
projector which
will project a 16nun. motion picture
at "sound" speed, then drop us aline
saying when and where the "fest" is
to be held and the individual to ship
the film to, and we will have it sent.
We know you will enjoy the showing.
Lallicrar+ers
CHICAGO, U. S. A.
USED
BY
33
inc.
GOVERNMENTS
•
SOLD
IN
89
COUNTRIES
OREL S-31
igh I
ide:ity
Tuner for
Fre quency
Afodu latin
und Ampli-
tude A10d/
I
-
lated Recép-
tion.
W you can have FM-AM recep-
tion by aturn of the bandswitch
with the Model S- 31 Hallicrafters
commercial FM-AM Tuner. Covering
the broadcast (AM) band and the
40-51 mc. high frequency (FM) band.
The Tuner combines the FM and AM
circuits in one chassis with either in-
stantly available at the turn of the
bandswitch.
SPECIFICATIONS-9 tubes—Frequency range,
band one; 550 to 1600 kc., band two; 40 to
51 mc.—Power output 130 milliwatts un-
distorted—Output impedances 500 and
5000 ohms—Power consumption 120 watts
—Controls: bandswitch, radiophone switch,
main tuning, audio gain, tone control, "S"
meter adjustment, phone jack. Operating
from 115-125 volts, 60 cycles AC. Panel
dimensions 19"x8
31
". Dust cover dimen-
/
sions 17"x 8"x 11%". Write for prices.
AMPLIFIER FOR MODEL S-31 TUNER
The Model S-31, aHallicrafters amplifier,
delivers 25 watts of high fidelity audio
power to either speaker or 500 ohm load.
Designed for rack mounting and for use
as a companion unit to the FM-AM
Model S-31 Tuner it will provide repro-
duction of sparkling depth and brilliance.
SPECIFICATIONS-6 tubes—Fidelity 2DB
from 50 to 15,000 cycles gain—Channel
No. 1, microphone <high impedance)
96 DE—Channel Na. 2, phone (low im-
pedance) 60 DB—Power output 25 wa
—Power consumption 100 watts—
put impedance No. 1, 500 ohms;
8 ohms; No. 3, 4 ohms. Die
panel
19"x8%".
Dust cover
Write for prices.
cra
USED
BY
33
air ERNMENTS
-
. SOLD
IN
89
COUNTRIES
VOL. 1
•
No. 1
FEBRUARY, 1941
S
TAFF
A. H. HALLORAN
Editorial Director
H. W. DICKOW
W6JYN
Managing Editor
L. R. HUBER
W7CRJ
Associate Editor
FRAN*. JONES
WoAJF
Technical Editor
C. C. ANDERSON
W6FFP
Engineering Draftsman
N. R. FARBMAN
W6SEM
Staff Photographer
L. L. FUNSTON
W6QQU
Illustrator
BUSINESS OFFICES
Monadnock Building
San Francisco, Calif.
AMATEUR RADIO DEFENSE
Published Monthly
Pacific Radio Publishing Co.
In the interests
of
Amateur Radio Defense Association
CONTENTS FOR FEBRUARY
Chats With the Editors
QRA's of Staff and Editorial Contributors
Activities of A.R.D. Members
The Editor's CQ
Plate Circuit Consideration's for R-F Amplifiers:
Frank C. Jones, W6AIF
Medium-Power CM or PM 'Phone-C.W. Transmitter:
F. D. Wells, W6QUC
Correct Design for Antenna Towers
B I. Osborne, W6QBU
8
10
17
18
21
26
30
34
40
•
Subscription Price:
$2.50 per year in the
U.S.A. and its posses-
sions. Elsewhere $3.00
per year.
Copyright 1941 by
Pacific Radio Publish-
ing Company. Techni-
cal matter must not
be reprinted without
permission.
High-Power Gammatron U H.F. Amplifier.... Winfield G. Wagener
Parasitic Oscillations, Part II
The Meissner Uni-Signal Selector
Taking the Curse Out of Circuit Design
The Engineering Forum
QRM and QRN
Transmitter Circuit of the Month
It Once Was Dx
The Single-Wire Antenna
Eddie Fiore
F D. Wells, W6QUC
Les Funston, W6QQU
Technical Staff
Stanley W. Johnson, W6SZ
Technical Staff
Technical Staff
44
48
50
52
56
58
64
68
78
,
Small C.W. Transmitter for 'Phone Men...A. W. Fonscca, W6NYQ
Engineering Applications
Application for Enrollment, A R.D A.

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